Valid Substring, C#

Valid Substring

//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
 
            int n;
            n = Int32.Parse(Console.ReadLine());  //Receive integer input
            for (int c = 0 ; c < n; c++)
            {
                string inputString = Console.ReadLine();
                char[] words = inputString.ToCharArray();
                int openParanthesisCount = 0;
                int closedParanthesisCount = 0;
                for (int i=0; i<words.Length;i++)
                {
                    if(words[i]=='(')
                    {
                        openParanthesisCount+=1;
                    }
                    else if (words[i]==')')
                    {
                        closedParanthesisCount+=1;
                    }
                }
                
                var completeStringLength = openParanthesisCount+closedParanthesisCount;
                
                if(openParanthesisCount == closedParanthesisCount)
                {
                    Console.WriteLine(completeStringLength);
                }
                
                else if(openParanthesisCount < closedParanthesisCount)
                {
                    var diff = closedParanthesisCount - openParanthesisCount;
                    Console.WriteLine(completeStringLength - diff);
                      
                }
                else if (openParanthesisCount > closedParanthesisCount)
                {
                    var diff =  openParanthesisCount - closedParanthesisCount;
                    Console.WriteLine(completeStringLength - diff);
                }
           
            }
          
        }
    }
}


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